Friction draft-gear.



E. W. NEWELL.

FRICTION DRAFT GEAR.

APPLICATION FILED SEPT. 2, 1915.

Patented Dec. 3, 1918.

3 SHEETS-SHEET] Q ,M 7 Q y k H m s I\III I I I I I I I I Il/f I ,IIIIIMNMI T ;IIJ m w M 4 III I .I S W, I NOM I MWFIII IIIIM m w IW. W hm 2, I 5. L m 1 N N @2.

E. W. NEWELL.

FRICTION DRAFT GEAR.

APPLICATION FILED SWR2. 1915.

Patented e0. 3, 1918.

Figa

5 N V E N TO ,a @ma-a" wwf E. W.'NEWELL.

rRlcTloN DAFT GEAR.

APPLICATION FILED SEPT. 2| l9l5.

Patented Dec. 3, 1918.

3 SHEETS-SHEET 3.

Umrnn Stearns PATENT" orrioii.y

EDWARI W. NEWELL, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO THE WESTING- HOUSE AIR BRAKE COMPANY, F PENNSYLVANIA.

0F WILMERDIN G, PENNSYLVANIA, A CORPORATION FRICTION DRAFT-GEAR.

Specication of Letters Patent.

Patented Dec. 3, 1918.

Application led September 2, 1915. Serial No. 48,641.

To all whom z't may concern: .Beit known that I, EDWARD a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented new and useflfl Improvements in Friction Draft- Gears, of 'which the following is a specification.

This invention relates to friction draft ear, and more particularly to a draft gear fior cars employed in passenger service.

In the handling of passenger cars, par ticularly sleeping cars at night, it is desirable to effect the shifting of cars and the like with the least possible jar. If draft gears of the usual high capacity are employed, the gears do not come into action under comparatively light buliing and draft stresses and consequently such stresses may be d1- rectly transmitted to the car and cause shocks which annoy and possibly awaken passengers. U

One object of my invention 1s to avoid the above condition by providing a friction draft gear having two stages of action, a preliminary friction movement 'suilicient to take care of light buiing and draft stresses W. NnWnLL,

A and a final movement which will provide the -usual high capacity to absorb shocks due to heavier buiing and draft stresses.

Another object of my invention is to provide means for centering the coupling which utilizes draft springs employed in the draft gear, so that a separate construction for that purpose is not required.

Another object of my invention 1s to provide improved means for placing thedraft springs under initial compression.

In the accompanying drawings; Figure 1 Fig. 3 a side elevation thereof; Fig. 4 a vertical longitudinal section, showing the parts compressed under a buiiing stressg'Flg. 5 a

transverse section on the line ze-a of Fig. 1; Fig. 6 avertical` longitudinal section of the draft gear, in part, showing the parts in position'beforethe keys are lnserted to place the'draft springs under initial compression;

and Fig. 7 a transverse section on the line b-b of Fig. 1. -p v .According to myinvent1on',the draft gear 4wall 4 of the casingl a vertical' longitudinal section of a fric-` .inital compression by and 11 under initia 1 and the friction members 24 are bers 24C each having an inclined friction face A 2l and rearwardly of the friction members 24 is a rear friction element 5 having oppositely inclined friction faces 6. Centrally of the gear there are arranged front and rear plunger wedges 7 and 8 each having oppositely lnclined friction faces and engaging the friction faces ofthe friction members 24, the friction element 5, and the plungerwedges 7 and 8, are wedge blocks 9. Mounted between the friction element and the rear -are draft springs, preferably comprising four sets ofi similar springs 10 and 1l.

Intel-posed between the end of the usual draw-bar 12 and the front plunger wedge 7 is a front follower 13 which is adapted when the gear is subjected to draft stresses to engage stops 14g-,secured to the car `center sills 15. 1

For transmitting draft stresses from the draw-bar to the draft gear, links 16 may be employed, the links being operatively connected to the draw-bar by a key 17, extending through elongated slots 18 in the links, which permit independent rearward movement of the key and draw-bar under draft stresses.

Said links extend through slots in the follower plate 13 and the casing 1 and the rear portions thereof are made round and r0- vided with screw threads for nuts 19. Additional draft springs are mounted on the rounded portions of the links 16 between the nuts 19 and a spring plate 21 which is adapted to engage stops 22, secured to the car center sills 15, when the springs 20 are compressed by the forward movement of the links. y

The spring plate 21 extends through slots 23 in the side walls 3 of the casing' 1, the slots being extended forwardly a certain amount to allow for inequalities in construction and for wear of parts.

The springs 20 may be placed under screwing up the nuts 19 and in order to put the set of springs 10 compression, the Casin provided with slots sorpositioned that when the parte ltaken np without 'varied a 'pulled forward by the diam-'bar eenibled the Slots ere ont of aline ree-nt, i f iown in l*`- ol the drawingsn ln or" to bring t slots into alinement for the insertion of a locking key 25, it is necessaire, te force the frietion .members 24 inward. By thin movement, the il are le-reed rearwardly .and the i'fosition Shown in Fig. l ofV are tiret e C' the drawn a tion element 5 loreed rearwardly, oompreseinvtlie springs l0 and lll, since the L' Springe nre held against e roer vrail of the easing l. nger wedge 8 is engaged by li extender to 'the rear will. el

of the easing l. ln operntiorn 'plied to the drenhbnr '1% the follower plate when e boiling stress is ap- 13 is moved rearwardly and with it the front plunger Wedge 7. The rear' plunger wedge S is held stationery by the engagement of ste-m26 .with the rear AWall Il of the easing l, sinee the easing is prevented from moving; rearwardly by engagement with the stops 22. 1`

The

ke il are eoneeqnently and laterally outward,

bloat :sing the Geringe l0 and lon tbe parte being; Shown in in: the dran'i ffs.- The springs il are i 'o eoi'npreesed b v 'thY engagenie ofthe i; lenient 'with the spring plate El and prerrably e certain il, the nltinnate p amount of rl farnnee 'is provided betere n'the v f" :lie 1li-trillen e nient Y spring p n 'gn'eliniinary BV i time l t pensed with the fell ng: movement of the part Under a draft et,"

ti'irougrh the engagement of the key 1LT therewith mid the easing l. is moved lknrfarfl by' the erru gageinent'ef the links with the proieetions. 27. eerried by tl; ringing l and extending i the linkin throne ,lote in The lorwerd niormnent et tno rear Wall l of the one ing-l then l e .lll arl l l and eoneequentlj/lr the'reax friov` the rear arielion element 5 'aloinovm 1'ea1,\ardly con ipre the frirtional rielion he raeietenee 'of the fric 'he front friction element having oppositely` held agaiinat forward movement bythe Steps,`4

il, the wedge blocks will be forced for wardly end laterally outward by the'movenient of the rear friction element 5.

The friction members 2.4 move forwardly with the easing 1 and thusprovide space for the movement of the Wedge blocks 9.

It 4will be noted that under a draft stress, the springs 2O are compressed by the forward movement of the links 1G, but the compressive movement of the springs is not transmitted to the friction elements, Since the. springs enginv the Spring plate 21 which is held against forward movement by the stops 22 and eonsequei'itly only,7 the spring reeistance of the .springs Q() is effective under draft stresses While the frietonal resistance is due entirely to the force of the springs 10 and il.

The resisting will therefore be trilling stresses.

By providing; n clearance space between the projer'tions il? und the rear walls of the slots in the linlrs le, as showin' the draft gear will `have e preliminary spring movenient due 'to the compression of the Springs 20, until the linke 3L engage the projections Q7, wnen the easing l 1will be moved to bring reQietance into action. If it is eeired te' have the frictiolnil resistance art from the start, this may be secured by inaliing` the slots 'that the linlfi Will engage the projections .27 ae soon as movement takes Qla'ce.

nother feature of the invention eonsibts in utilizing); draft springs 'lor centering the diams-bar, So that a special devire for this 'purpose need not be {a1-milled.

' 'this connection, it will be noted that 1 links lf3 when pulled forward', tend to compress the Springs 20. Non' il there is :my lateral movement of the draw-'bar7 one or 'the other of the links 1G lwill be pulled forward7 but sinl'e this movement compresses capacity of the draft gear lees under draft than under the f -erreepending spring 20, there is a conetant tendene),Y el. the springe to 'return to no1-inni position so thattlie forre of the geringe is, exerted to maintain the draw-bar in i i cent al position.

tion meinem;E @el will be referred to as inclined 'friction faces.

Hering; new described my invention, What l elaini as new and desire to secure by Letters Patent7 is:m

l ln. a frietion draft gear, the combinatien with afjeesing, friction' elen'xents,"and

draft springs; engaging sind casing for re-v sisting movement of seid friction elements,

in the links without elearanrrnA fore in the claims, the easing l and the lo/sfs/ting movement of said of link members, and springs engaging said link resisting movement of said 2. In a friction draft gear,-the combination with a'casing, friction element? and draft springsfengaging said casing `or resisting movement of said friction elements, .of link members, and additional draft springs engaging said link members .for also friction 'elements after a kpredetermined initial movement thereof.

3. In a friction draft gear, the combination with a draw-bar, of friction members, draft springs for opposing movement of the friction members under draft stresses applied to the draw-bar, links for transmittin draft stresses from the draw-bar to the dra gear, stops and additionalsprings mounted on said links and adapted to .becompressed against said stops under draft stresses apv. 0

. v ing, front friction members having inclined plied to the links.

4. The combination with a draw-bar, of a,

gear comprising a casing havfriction draft ing front oppositelyinclined friction faces associated therewith, a rearfriction element havingl oppositely inclined friction faces, central plunger Wedges having oppositely" inclined friction faces, Wedge blocks having friction faces adapted to lengage the friction faces of the casing and the plunger wedges, main draft springs for opposing movement of the friction members, links'operatively connecting the draw-bar to the draft gear, springs for opposing preliminary draft movement of the links, said links being adapted upon a further draft movement to engage the casing and thereby effectv the movement'of the friction members against the resistance of the main draft springs.

5. The combination with a-draW-bar, of a draft gear comprising friction elements and provided with side links for transmittin draft stresses from the draw-bar to the dra t gear, and a spring associated with each link for opposing draft movements 0f the links and tending to maintain the draw-bar in normal position, said springs being adapted additionsif ,draft friction lements. i

members for re- ,compressing the springs.

"6. The combination With a dravv-bar, of a' draftgear comprising friction elements and provided with side links for transmittin draft stresses from the draw-bar to the draft gear, and a separate spring associated with each link ,and adapted to resist movement of theIfri/ction dra-ft movements of the links, lateral movement o f the draw-bar being resistedby the compressive action of the springs.

he combination with a draw'bar, of a draft dgear comprising friction elements and provi ed vvith side links for transmittin gear and a spring mounted on each link for resisting draft movements the drawbar,'said springs between the links and the 8. A friction draft gear being interposed comprising a caselements-and for opposing I draft stresses from the draw-bar to the draft and for centering 'i friction elements'.

keys for securing the front friction members to the casing with the friction parts 9. Afriction draft gear comprising friction members, main draft springs for opposing the initial movement of the friction members underbuiiing stresses, additional draft springsfor opposing` further movement of the friction members, and stops for preventing the additional springs from acting toy oppose the movement ofthe friction members under draft stresses.

In testimony whereof I have hereunto set my hand.

' EDWARD W. N EWELL. Witnesses:

A; M. (ELEMENTS, BARBARA HERBERT. 

